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l. STEENROD.

CENTERING DEVICE FOR CIRCULAR SAWS.

APPLICATION FILED FEB. l4, I919.

Patented Aug. 12, 1919.

WITNESS: INVENTOR.

//? Vl/Y STEEJ/ROD A TTORNE Y.

IRVIN STERN-non," or 'MoNroUnsvILLE; PENNSYL ANIA.

CENTERTNG DEVICE FOR} CIRCULAR SAWS.

I Specification of Letters Patent.

Patented A11. 12, 1919.

ApplicationfiIedFebruary 14,1919. Serial No.277,084.

-toursville, in=the county of Lycoming and State of Pennsylvania, have invented certain new and useful Improvements in Centering Devices for Circular'Saws; and I do hereby declare'the following tobe a full,cle'ar, and exact 'description of the-invention, such as willenable others skilled in the art to which it appertains' to' make and use the same, reference'being had to the accompanying drawings, and to the letters'and figures of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvenieents irr-devicesforcentering saws f upon arbors in jointing the saw, and consists essentially in the provision of two clamping collars mounted upon an arbor, with a conical-shaped centering member adapted to engage apertures of different diameters in the circumference of the saw, and in the provision of means for holding the collars in clamping relation with the saw.

The present invention contemplates the use of an arbor such as may be employed for emery wheels and which arbor is utilized for holding the saw after the emery wheel has been removed therefrom.

The invention comprises a simple and efficient device of this character having various details of construction, combination and arrangement of parts which will be hereinafter fully described, shown in the accompanying drawings and then specifically defined in the appended claims.

My invention is illustrated in the accompanying drawings which, with the letters of reference marked thereon, form a part of this application and in which:

Figure 1 is 'a central vertical sectional view through the parts shown as secured in place upon the arbor.

Fig. 2 is a face view of the saw and one of the clamping collars and centering member.

gig. 3 are views of the parts disassembled,- an

Fig. 4 is a detail view of a spanner wrench member for tightening the centering member.

Reference now being had to thedetails of the drawings by letter:

A designates an arbor driven in any suitable mannerand upon which the saw is to be held while being jointed. Said arbor has a threaded portion B to receive a tightening nut C interi-orly threaded, and having diagonally oppositely disposed notches-C to receive the fingers D of the spanner wrench D, detail of which is shown in Fig. 4 of the drawings. A centering member designated by letter E'h'asits inner end conical-shaped and'adaptedto engage apertures of different diameters in "saws of various sizes. Said member Eis provided with a central opening and has a'shoulder E. therein and an enlarged chambered portion E of cylindrical outline and which issadapted to receive the tightening nut 0, detail of which is shown in Fig. 3 of the drawings.

A clamping collar H has a central aperture adapted to fit over the arbor and against a shoulder A of the latter, as shown in Fig. 1 of the drawings, and has an enlarged chambered portion H adapted to receive the tapering or conical shaped end of the centering member E. A second clamping collar L is provided with an opening therein, the 'wall of which is threaded, adapted to engage the threads E upon the circumference of the centering member E.

Washers K are shown in Fig. 1 of the drawings as mounted upon the arbor A and are positioned between the tightening nut C and the shoulder E. These washers are utilized where the threaded portion of the arbor shaft is longer than usual.

In adjusting the saw upon the arbor the clamping collar H is first placed upon the arbor and against the shoulder, after which the saw is placed against the face of the collar H with its central opening registering with the chambered portion H, after which the centering member E is inserted through the opening in the saw. The washers are then inserted in place where the threaded portion of the arbor is of considerable length and the nut fitted on the arbor and screwed up against the washers, forcing the same against the shoulder E, and tending to move the centering member tightly in place with its tapering circumference in engagement with the wall of the aperture in the saw. In the event of the arbor having a short threaded portion, the washers may be dispensed with and the nut fitted to the arbor' and made to bear in direct contact with the shoulder E. The nut (3 may be rotated either direct or by means of the spanner wrench, the fingers of which are designed to engage the notches C in the collar.

After the centering member has been adjusted in position the clamping collar L is turned about the circumference of the centering member until the inner end thereof will clamp the face of the saw, thus securely holding the same as in a vise, and the saw may then be jointed in any suitable manner by holding the jointing instrument, of Whatever nature, against the teeth as they are rapidly rotated.

What I claim to be new is:

1. A device for centering saws, comprising a chambered clamping collar adapted to fit loosely upon a rotatable arbor and against a shoulder thereon, a centering member having a tapering portion adapted to pass through the central aperture of a circular saw, and entering the chambered portion of said collar, a screw adapted to engage a threaded portion of an arbor to hold the cen tering'member in an adjusted position, and a clamping collar fitted about the centering member and cooperating with the other clamping collar to hold the saw securely intermediate the same.

2. A device for centering saws, comprising a chambered clamping collar adapted to fit 3o loosely upon a rotatable arbor and against a shoulder thereon, a centering member having a tapering portion adapted to pass through the central aperture of a circular saw and entering the chambered portion of said collar, said centering member having an enlarged chambered portion terminating in a shoulder, a nut adapted to fit upon a threaded portion of the arbor and to bear against the shoulder in said centering mem- -10 ber to hold the latter in an adjusted position, and a clamping collar internally threaded and adapted to engage the threads upon the circumference of said centering member.

In testimony whereof I hereunto aflix my signature in presence of a witness.

IRVIN STEENROD.

Witness A. L. HOUGH.

Gopiea of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

